/ Dictionary / Index G gravity railroad: Meaning and Definition of Find definitions for: grav'ity rail"road Pronunciation: [key] a railroad depending partly on the force of gravity for motive power. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gravity meter gravity wave Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language